I try to create UltraMonSystem object in C# using the sdk and all I get is this exception:

Unhandled Exception: System.InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to interface type 'ULTRAMONLib.UltraMonSystem'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{4EC0850A-E469-4CAB-8214-9A10FEEE62F7}' failed due to the following error: Schnittstelle nicht unterstützt (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
at Screenchanger.Program.Main(String[] args)